The tests they're looking at are against hospitalisations/deaths.Tweet
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Took ‘em a while but they got there in the end. Seems strange to not give both doses though. Where’s the evidence of one dose efficacy?
https://assets.publishing.service.g...465/Vaccine_surveillance_report_-_week_36.pdf are calculating:
For delta - Single dose - 80% (69 to 88)
The antibody studies suggest the vaccines kick in fast in the under 30s so it's a reasonable compromise to keep schools functioning well during autumn term while they wait for more data. Whether it does that is the watch this space element of the story.
The myocarditis risk in young teenagers seems to be heavily weighted towards the second dose.